This study aims to investigate the relationship between narcissism as a personality trait and travel-related posting behavior on social media of individuals, as well as to examine the mediation effects of psychological motivations (i.e., need-for-uniqueness and approval-seeking). Data was collected via an online survey (n = 413) and analyzed employing simple linear regressions in SPSS v.25.0. Then, a series of mediation analyses were conducted using PROCESS v.4.0 macro Model 4. Our findings revealed that two subtypes of narcissism - grandiose and vulnerable - significantly predicted travel-related posting behavior. Further, results showed that the relationships between both narcissistic subtypes and the posting behavior were significantly mediated by need-for-uniqueness and approval-seeking motivations, respectively.